function import_css(css) {
	if (window.screen && window.screen.width >= 600) {
		var h = document.getElementsByTagName('head')[0];
		var c = document.createElement('link');
		
		c.setAttribute('rel', 'stylesheet');
		c.setAttribute('type','text/css');
		c.setAttribute('media','screen,projection');
		c.href = css;
		h.appendChild(c);
	}
}